GB976781A - Ultra high vacuum ion gauge - Google Patents

Ultra high vacuum ion gauge

Info

Publication number
GB976781A
GB976781A GB30325/62A GB3032562A GB976781A GB 976781 A GB976781 A GB 976781A GB 30325/62 A GB30325/62 A GB 30325/62A GB 3032562 A GB3032562 A GB 3032562A GB 976781 A GB976781 A GB 976781A
Authority
GB
United Kingdom
Prior art keywords
electrons
electron
produced
trap means
high vacuum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB30325/62A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Geophysics Corp of America
Original Assignee
Geophysics Corp of America
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Geophysics Corp of America filed Critical Geophysics Corp of America
Publication of GB976781A publication Critical patent/GB976781A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
    • H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
    • H01J41/08—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of radioactive substances, e.g. alphatrons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
    • H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
    • H01J41/04—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of thermionic cathodes

Landscapes

  • Measurement Of Radiation (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

976,781. Ion gauges. GEOPHYSICS CORPORATION OF AMERICA. Aug. 8, 1962, No. 30325/62. Heading H1D. An ultra high vacuum ion gauge includes a source of electrons 20, an anode 32 for forming the electrons into a beam 22 directed towards trap means 36 for receiving the electrons, the trap means being arranged to absorb most of the X-rays 48 produced by the electrons, and a collector 34 for receiving ions produced by the electrons before reaching the trap means. The electron source may be a hot filament or a radio-active source which will give off sufficient electrons to ionize the gases within the gauge. A longitudinal magnetic H may be provided to focus the beam. The collector electrode 34 is circular and is positioned so that no primary or secondary X-rays produced within the device can strike it. Alternatively, the ions produced may be accelerated by potentials applied to grids provided adjacent the electron beam to a secondary electron emissive surface, the secondary electrons from which are amplified by an electron multiplier.
GB30325/62A 1961-12-08 1962-08-08 Ultra high vacuum ion gauge Expired GB976781A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US158044A US3292078A (en) 1961-12-08 1961-12-08 Vacuum gauge having an X-ray trap and a shield

Publications (1)

Publication Number Publication Date
GB976781A true GB976781A (en) 1964-12-02

Family

ID=22566474

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30325/62A Expired GB976781A (en) 1961-12-08 1962-08-08 Ultra high vacuum ion gauge

Country Status (2)

Country Link
US (1) US3292078A (en)
GB (1) GB976781A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1379746A (en) * 1963-10-16 1964-11-27 Csf New gauge for measuring very low pressures
US3394286A (en) * 1965-05-27 1968-07-23 Nat Res Corp Ultrahigh vacuum measuring ionization gauge
US3341727A (en) * 1965-11-03 1967-09-12 Univ Illinois Ionization gauge having a photocurrent suppressor electrode
US3435334A (en) * 1966-04-04 1969-03-25 Varian Associates Method and apparatus for measuring high vacuums
DE1648650A1 (en) * 1966-05-17 1971-07-22 Politechnika Warszawska Ionization vacuum meter for lowest pressures
US3465189A (en) * 1966-10-13 1969-09-02 Canadian Patents Dev Ionization vacuum gauge with x-ray shielding and ion reflecting means
US3378712A (en) * 1966-11-18 1968-04-16 Gen Electric Field emission ionization gauge with restricted line of sight between field emissionanode and ion collector
GB1437174A (en) * 1972-05-26 1976-05-26 Mullard Ltd Ion gauges

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB709266A (en) * 1950-02-09 1954-05-19 Post Office Improvements in or relating to ionisation gauges
NL284213A (en) * 1961-10-11

Also Published As

Publication number Publication date
US3292078A (en) 1966-12-13

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